package com.ruoyi.web.controller.system;

import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import com.ruoyi.common.core.controller.BaseController;

/**
 * 图片验证码（支持算术形式）
 *
 * @author ruoyi
 */
@Controller
@RequestMapping("/captcha")
public class SysCaptchaController extends BaseController {
  @Resource(name = "captchaProducer")
  private Producer captchaProducer;

  @Resource(name = "captchaProducerMath")
  private Producer captchaProducerMath;

  /**
   * 验证码生成
   */
  @GetMapping(value = "/captchaImage")
  public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) {
    ServletOutputStream out = null;
    try {
      HttpSession session = request.getSession();
      response.setDateHeader("Expires", 0);
      response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
      response.addHeader("Cache-Control", "post-check=0, pre-check=0");
      response.setHeader("Pragma", "no-cache");
      response.setContentType("image/jpeg");

      String type = request.getParameter("type");
      String capStr = null;
      String code = null;
      BufferedImage bi = null;
      if ("math".equals(type)) {
        String capText = captchaProducerMath.createText();
        capStr = capText.substring(0, capText.lastIndexOf("@"));
        code = capText.substring(capText.lastIndexOf("@") + 1);
        bi = captchaProducerMath.createImage(capStr);
      } else if ("char".equals(type)) {
        capStr = code = captchaProducer.createText();
        bi = captchaProducer.createImage(capStr);
      }
      session.setAttribute(Constants.KAPTCHA_SESSION_KEY, code);
      out = response.getOutputStream();
      ImageIO.write(bi, "jpg", out);
      out.flush();

    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        if (out != null) {
          out.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return null;
  }
}